Trihedral corner pad



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JUE? E2 w49- E. B. KllNcAlD 476,197

TRIHEDRAL CORNER PAD Filed Feb.- 28, 1948 2 Sheets-Sheet l ffLL/czlof/ dii/f uy E2, i949. E B, KlNCAgD 2,476,197

TRIHEDRAL CORNER PAD Filed Feb. 28, 1948 2 Sheets-Sheet 2 V @gm wlw Patented July l2, 1949 TRIHEDRAL CORNER PAD Elbert B. Kineaia, cincinnati, om, assigner to Container Corporation of America, Chicago, Ill., a corporation of Delaware l Application February 28,1948, Serial No. 12,101

This invention relates, generally, to devices for preventing injury to furniture and the like during handling and shipment thereof, and it has particular relation to devices for protecting the corners of furniture and the like although its use is not so limited.

Among the objects of this invention are: To form a trihedral corner pad from a blank of paperboard; to fold the blank so that the sides of the pad will be triangular; to form a right trihedral pad with intersecting right triangular sides; to lock the pad in the set up position solely by frictional engagement between certain of its panels; and tocut and score the blank in such manner that six rectangular panels and twelve triangular semi-panels are formed in such relationship that they can be interfolded to make a corner protector pad as aforesaid.

lOther objects of this invention will, in part, be obvious and in part appear hereinafter.

This invention is disclosed in the embodiment thereof shown in the accompanying drawings and it comprises the features of construction, combination of elements and arrangement of parts which will be exemplified in the construction hereinafter set forth and the scope of the application of which will be indicated in the appended claims.

For a more complete understanding of the nature and scope of this invention, reference can be had to the following detailed description, taken together with the accompanying drawings, in which:

Figure 1 is a plan view of a paperboard blank that has been cut and scored to provide a right trihedral pad with intersecting right triangular sides when the various elements or panels or semi-panels are folded along the proper score lines;

Figure 2 is a top plan View of the blank shown in Figure 1 with two of the triangular semi-,panels forming parts of rectangular panels on opposite sides of a relatively wide slot folded along diagonal score lines;

Figure 3 is a plan view of the next step in the folding of the blank from its condition in Figure 2 wherein the previously folded panels are folded over the intermediate panels to provide a generally rectangular conguration; Figure 4 is a top plan view of the blank illus trated in Figure 3 with the corner semi-panels there shown folded inwardly except for one of the semi-panels of one of the pair of panels adjacent the narrower slot;

3 Claims. (Cl. 229-14) 2 shown in Figure 4 with two of the triangular sides of the nal right trihedral pad configuration being folded vinto right angular relationship; Figure 6 shows the next step wherein the three sides of the trihedral pad have been folded into right trihedral relationship with the locking semipanel in position to be folded into the locking position; and

Figure 7 is a perspective view of the completed right trihedral pad.

Referring now particularly to Figure 1 of the drawings, it will be observed that the reference character Ill designates, generally, a blank of paperboard, such as double face corrugated paperboard or double wall corrugated paperboard. It will be understood that other similar materials can be employed as may be desired.

The blank Ill is generally rectangular and is divided into six substantially square panels II, I2, I3, I4, I5 and I6. The panels II and I2 are located along one side of the panels I3 and I4 which comprisethe intermediate portion of the blank and they are separated by a relatively wide slot I1 the function of which will be set forth hereinafter. The end panels I5rand IB are located along the other side of the intermediate panels I3 and I4, as shown. The panels I5 and I6 are separated by a slot I8 that is relatively Figure 5 is a perspective view of the blank as 55 narrow as compared to the width of the slot I1. The function of the slot I8 will be set fort?.l presently.v

It is desirable to fold the panels II through I6 along certain of their diagonals. Accordingly, for this purpose they are provided with score lines 2l through 26 along their respective diagonals as shown in Figure 1. It will be observed that score lines 23, 24, 25 and 26 form a square coniiguration and that score lines 2| and 22 are parallel, respectively, to score lines 25 and 26.

It will be noted that the score lines 2I through 26 divide the respective panels II through I6 into triangular semi-panels IIa, IIb, I2a, I2b,`

I3a, I3b, Ida, Mb, lia, I5b, Illa andv IBb. It will be noted also that these semi-panels are right triangles. l

In order to take care of the thickness of the material forming the'blank I0 when the various semi-panels arefolded along the score lines 2I through 26, additional score lines 2I' through 26" are provided parallel to the score lines 2| through 26 respectively. The distance between each set of parallel score lines will, of course, depend upon the thickness of the material used for the blank Il).

Additional score lines 29, 30, 3l and 32 are described hereinbefore.

provided along the edges of the panels I3 and I4 to permit folding of the panels II, I2, I5 and I6 with respect thereto. Score lines 28' and 38' are provided parallel to the score lines 23 and 38, respectively, to take care of the material thickness. A score line 33 is provided between the panels I3 and I4 to permit folding of the same therealong. It will be observed that the score line 33 extends between the inner ends of the slots I'I and I8 which extend inwardly from opposite ends of the blank I0. Also. it will be noted that a portion of the inner end of the slot I'I, indicated at 34, constitutes an extension of the score lines 2I and 24 and that another portion 35 at the inner end of the slot I1 constitutes an extension of the score line 22. The inner end 35 of the slot I8 is located beyond the score lines 3| and 32 to permit folding of the associated walls into the final right trihedral relationship.

It will be understood that the blank I first is cut and scored as indicated in Figure 1 and Various steps may be taken in order to fold the blank I8- into the desired right trihedral corner pad. The preferred sequence of steps for accomplishing this will be set forth now. l

The semi-panels IIa and I2a may be folded in the directions indicated by the arrows 3l and 38 about the score lines 2| and 22 into the construction shown in Figure 2. When so folded the semi-panels Ila and I2a are superimposed on the corresponding semi-panels IIb and I2b, thereby forming a double thickness. Next these semi-panels are folded in the directions indicated by the arrows 39 and 40 about the score lines 29 and 3U to provide the generally square configuration shown in Figure 3. Here the semipanel IIb overlies the semi-panels IIa and I3a while the semi-panel I2b overlies the semi-panels I2a and I 4a. These three thicknesses of semipanels are then folded in the directions indicated by the arrows 4I and 42 about the score lines 23 and 24 to form the construction illustrated in Figure 4. Also the semi-panel Ia is folded about the score line 25 to overlie the semi-panel I5b.

Now the semi-panel I5a, as shown in Figure 4, and the underlying semi-panel I5b are folded about the score line 3| in the direction indicated by the arrow 45 until a right angular relationship is provided with respect to the semi-panel I3a. Thereafter, as illustrated in Figure 5, the semipanels I5a and 13a are folded about the score line 33 in the direction indicated by the arrow 46. This places the semi-panels I3a, I4a and i5a in right trihedral relationship, as shown in Figure 6, with the semi-panel IBa extending forwardly, as illustrated.

Finally the semi-panel IBa is folded about the score line 28 and also along the score line 25' in the direction indicated by the arrow 41 into the space between the semi-panels I3a and I4a to provide the nished right trihedral pad that is indicated, generally, at 48 in Figure 7. The semi-panel Ilia is so dimensioned that it has a snug frictional fit with the adjacent surfaces of the semi-panels I3a and |411` when the pad `48 is in the set up position. Therefore, it is unnecessary to employ an adhesive or staples or similar fastening means for holding the corner pad 48 in the set up condition. This friction locking of the pad 48 in the set up condition constitutes an important feature of this invention.

It will be observed that the semi-panel I3a overlies three thicknesses of material when the corner pad 48 is set up and that the semi-panel I4a likewise overlies three thicknesses of material. The semi-panel I6a overlies three thicknesses of material in the set up condition. Thus each side of the corner pad 48 comprises four thicknesses of the material.

The space provided along the line 34 at the inner end of the slot I1, shown in Figure 1, permits the three thicknesses of material to be folded along the score line 33 until the edges thereof are `iuxtaposed with the adjoining surface of the semi-panel I4b. In like manner the portion along the line 35 at the inner end of the slot II permits the three thicknesses of material to be juxtaposed to the adjoining portion of the semi-panel 13a. The inner end 3B of the slot I8 permits the folding along the score line 33 as illustrated in Figures 5 and 6 of the drawings with sufficient clearance so that the desired right trihedral relationship is provided between the triangular sides of the friction locking corner pad 48.

Since certain changes can he made in the foregoing construction and different embodiments of the invention can be made without departing from the spirit or scope thereof, it is intendedthat all matter shown in the accompanying drawings and described hereinbefore shall be interpreted as illustrative and not in a limiting sense.

What is claimed as new is:

1. A paper board blank foldable to provide a trihedral corner pad having triangular sides, said blank being substantially rectangular and comprising two sections each having a central panel and an upper panel and a lower panel hinged to the upper and lower edges of said central panel along fold lines, said upper panels and said lower panels being spaced apart and said central panels being hinged together at their inner edges along a central fold line perpendicular to the fold lines between said upper and lower panels and said central panels, said panels being substantially square and provided with diagonal fold lines separating the respective panels into two triangular semi-panels, the diagonal fold lines of said central panels and the diagonal fold lines of said lower panels together defining an approximate square, the diagonal fold line of the respective upper panels being substantially parallel with the diagonal fold line of the corresponding lower panel.

2. A paper board blank foldable to provide a trihedral corner pad having triangular sides, said blank comprising a rst triangular panel and a second triangular panel hinged together along an upwardly extending common fold line. a third triangular panel hinged at its upper edge to the lower edge of said first panel along a fold line substantially perpendicular to said first fold line, and a fourth panel of substantially rectangular shape separate from said rst and third panels and hinged at its upper edge to the lower edge of said second panel along a fold line substantially` perpendicular to said iirst fold line, said fourth its outer upper corner and dividing said fourth panel into two triangular semi-panels.

3. A paper board blank foldable to provide a trihedral corner pad having triangular sides. said blank comprising a first rectangular panel and a second rectangular panel hinged together along an upwardly extending central fold line, said panels being provided with diagonal fold lines extending from their upper inner corners and dividing them respectively into two triangu- REFERENCES CITED The following references are ofl record in the tile of this patent:

the fold line of said rst panel and dividing said l0 2,271,265

fourth panel into two triangular semi-panels.

ELBERT B. KINCAID.

5 UNITED STATES PATENTS Number Name Date 1,667,279 Auen Apr. 24, 192s 2,006,224 weber et a1 June 25, 1935 Kirby Jan. 27, 1942 2,324,031 schmenhaus July 1a, 194s 2,348,483

Lacy 2d et al May 9, 1944 

